Devise

Devise is a flexible authentication gem.

Installation

Rails 3: Add the following to your Gemfile

gem "devise"
gem "hpricot"
gem "ruby_parser"

Install devise in your project

$ rails generate devise:install

Generate devise for your model

$ rails generate devise MODEL
$ rake db:migrate

(Optional) Generate devise views

$ rails generate devise:views

Helpers

user_signed_in?
current_user
user_session
destroy_user_session_path (Logout)
new_user_session_path (Login)
edit_user_registration_path (Edit registration)
new_user_registration_path (Register new user)

Controller stuff

before_filter :authenticate_user!

Model

Model options

class User < ActiveRecord::Base
  devise :database_authenticatable,
    :registerable,
    :confirmable,
    :recoverable,
    :rememberable,
    :trackable,
    :validatable
end

Migration helpers

create_table :users do |t|
  t.database_authenticatable
  t.confirmable
  t.recoverable
  t.rememberable
  t.trackable
  t.timestamps
end

Routing

Authenticated and unauthenticated routes

unauthenticated do
   root :to => 'home#index'
end

authenticated do
  root :to => 'dashboard#index'
end

As

as :user do
  get 'sign_in', :to => 'devise/sessions#new'
end

Devise_for magic

devise_for :users

    # Session routes for Authenticatable (default)
         new_user_session GET  /users/sign_in                    {:controller=>"devise/sessions", :action=>"new"}
             user_session POST /users/sign_in                    {:controller=>"devise/sessions", :action=>"create"}
     destroy_user_session GET  /users/sign_out                   {:controller=>"devise/sessions", :action=>"destroy"}
   
    # Password routes for Recoverable, if User model has :recoverable configured
        new_user_password GET  /users/password/new(.:format)     {:controller=>"devise/passwords", :action=>"new"}
       edit_user_password GET  /users/password/edit(.:format)    {:controller=>"devise/passwords", :action=>"edit"}
            user_password PUT  /users/password(.:format)         {:controller=>"devise/passwords", :action=>"update"}
                          POST /users/password(.:format)         {:controller=>"devise/passwords", :action=>"create"}
   
    # Confirmation routes for Confirmable, if User model has :confirmable configured
    new_user_confirmation GET  /users/confirmation/new(.:format) {:controller=>"devise/confirmations", :action=>"new"}
        user_confirmation GET  /users/confirmation(.:format)     {:controller=>"devise/confirmations", :action=>"show"}
                          POST /users/confirmation(.:format)     {:controller=>"devise/confirmations", :action=>"create"}

Customizing devise_for

devise_for :users,
  :path => "usuarios",
  :path_names => {
    :sign_in => 'login',
    :sign_out => 'logout',
    :password => 'secret',
    :confirmation => 'verification',
    :unlock => 'unblock',
    :registration => 'register',
    :sign_up => 'cmon_let_me_in' }

Test helpers

include Devise::TestHelpers
https://github.com/plataformatec/devise/blob/1094ba65aac1d37713f2cba71f9edad76b5ca274/lib/devise/test_helpers.rb

sign_in @user
sign_out @user